Wireless power transmitting apparatus and wireless power receiving apparatus

ABSTRACT

A wireless power transmitting apparatus can include a substrate; a first transmitting coil and a second transmitting coil disposed on the substrate; a third transmitting coil disposed on the first transmitting coil and the second transmitting coil; and an adhesive disposed between the substrate and the first and the second transmitting coils, in which the substrate includes a first portion disposed inside an inner circumference of the first transmitting coil; a second portion disposed inside an inner circumference of the second transmitting coil; a third portion disposed between the first transmitting coil and the second transmitting coil; and a peripheral portion disposed outside an outer circumference of the first transmitting coil and an outer circumference of the second transmitting coil, in which an inner area disposed inside an inner circumference of the third transmitting coil overlaps the third portion, a part of the first transmitting coil and a part of the second transmitting coil in a vertical direction perpendicular to the substrate.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of U.S. patent application Ser. No.15/515,022 filed on Mar. 28, 2017, which was filed as the National Phaseof PCT International Application No. PCT/KR2015/009462, filed on Sep. 8,2015, which claims priority under 35 U.S.C. 119(a) to Patent ApplicationNo. 10-2014-0130529, filed in the Republic of Korea on Sep. 29, 2014,all of which are hereby expressly incorporated by reference into thepresent application.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to wireless charging, and morespecifically, a wireless power transmitting apparatus and a wirelesspower receiving apparatus included in a wireless charging system.

Description of the Related Art

As wireless communications technology is continuing to advance, wirelesspower transmitting/receiving technology which wirelessly transmits powerto electronic devices has started to receive more attention. This typeof wireless power transmitting/receiving technology may be diverselyapplied not only to battery charging of mobile terminals but also todelivery of power to home appliances, electric cars, or subways.

The wireless power transmitting/receiving technology uses a fundamentalprinciple of magnetic induction or magnetic resonance. In order toincrease an efficiency of the power transmission/reception, it isnecessary to maintain a proper level of inductance by increasing aneffective permeability of the wireless power transmitting/receivingapparatus.

Meanwhile, the wireless power transmitting/receiving apparatus mayinclude a substrate, a soft magnetic layer disposed on the substrate anda coil disposed on the soft magnetic layer. In this case, the coil iswound in parallel to a plane of the soft magnetic layer. Due to alimitation related to size of the coil which is wound, there is alimitation in regards to achieving a desired level of the effectivepermeability.

In particular, there is a problem related to the wireless powertransmitting/receiving apparatus applied to a vehicle in that it isdifficult to apply a high-permeability-pellet to a soft magnetic layerdue to vibration or temperature variation characteristics.

Moreover, due to the vibration characteristics, a double-sided tapewhich is very thick should be used between the substrate and the softmagnetic layer and between the soft magnetic layer and the coil. Thus,there is a limitation in terms of being able to increase thepermeability by increasing the thickness of the soft magnetic layer.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a wireless powertransmitting apparatus and a wireless power receiving apparatus of awireless charging system.

According to an aspect of the present invention, a wireless powertransmitting apparatus of a wireless charging system includes asubstrate, a first bonding layer formed on the substrate, a softmagnetic layer formed on the first bonding layer, a second bonding layerformed on the soft magnetic layer and a transmitting coil formed on thesecond bonding layer, wherein at least one of the first bonding layerand the second bonding layer includes a magnetic substance.

At least one of the first bonding layer and the second bonding layer mayinclude a magnetic layer which includes a magnetic substance, and abonding agent which is formed on both sides of the magnetic layer.

The magnetic layer may include at least one of a sendust, a permalloyand MPP (Molybdenum Permalloy Powder).

A metal ribbon may be further formed between the magnetic layer and thebonding agent.

The bonding agent may include an insulation material.

The bonding agent may include at least one of an acrylate-based organicbonding agent, an epoxy-based organic bonding agent and a silicon-basedorganic bonding agent.

At least one surface of the first bonding layer and the second layer maybe film-forming processed with an insulation material.

The insulation material may include SiO₂.

A support film may be further formed on the transmitting coil.

The soft magnetic layer may include a composite comprising any one ofsingle metal powder/flakes or alloy powder/flakes and a polymer resin.

The alloy powder/flakes may be Fe, Co and Ni alloy powder/flakes or Fe,Si and Cr alloy powder/flakes.

The polymer resin may include at least one of a PV (polyvinyl)-basedresin, a PE (polyethylene)-based resin and a PP (polypropylene)-basedresin.

According to an aspect of the present invention, the wireless powerreceiving apparatus of the wireless charging system includes asubstrate, a first bonding layer formed on the substrate, a softmagnetic layer formed on the first bonding layer, a second bonding layerformed on the soft magnetic layer, and a receiving coil formed on thesecond bonding layer, wherein at least one of the first bonding layerand the second bonding layer includes a magnetic substance.

According to an aspect of the present invention, the bonding layer ofthe wireless power transmitting apparatus or the wireless powerreceiving apparatus of the wireless charging system includes a magneticlayer including a magnetic substance, and a bonding agent formed on bothsides of the magnetic layer.

According to an embodiment of the invention, it may be possible toincrease the effective permeability of the wireless power transmittingapparatus and the wireless power receiving apparatus, and to increasethe inductance of the wireless power transmitting apparatus and thewireless power receiving apparatus. Therefore, the efficiency of powertransmitting/receiving between the wireless power transmitting apparatusand the wireless power receiving apparatus can be increased.

In particularly, it may be possible to obtain a wireless powertransmitting apparatus that can also be stably applied to a vehicle inwhich there are vibration and temperature variation characteristics.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram of a wireless charging system according to anembodiment of the present invention;

FIG. 2 is a view illustrating a method of wireless power transmissionand reception for a wireless charging system according to an embodimentof the present invention;

FIG. 3 is an equivalent circuit diagram of a transmitting coil accordingto an embodiment of the present invention;

FIG. 4 is an equivalent circuit diagram of a power source and a wirelesspower transmitting apparatus according to an embodiment of the presentinvention;

FIG. 5 is an equivalent circuit diagram of a wireless power receivingapparatus according to an embodiment of the present invention;

FIG. 6 is a top view of a soft magnetic layer and a transmitting coilincluded in a wireless power transmitting apparatus according to anembodiment of the present invention;

FIG. 7 is a top view of a soft magnetic layer and a transmitting coilincluded in a wireless power transmitting apparatus according to anotherembodiment of the present invention;

FIG. 8 is a cross-sectional view of a wireless power transmittingapparatus according to an embodiment of the present invention;

FIG. 9 is a cross-sectional view of a bonding layer included in awireless power transmitting apparatus according to an embodiment of thepresent invention;

FIG. 10 is a graph, when a bonding layer does not include a magneticsubstance, explaining an increasing rate of inductance based on anincrease in permeability thereof, and FIG. 11 is a graph, when a bondinglayer does not include a magnetic substance, explaining an increasingrate of inductance based on an increase in a thickness thereof;

FIG. 12 is a graph, when a bonding layer includes a magnetic substance,explaining an increasing rate of inductance based on an increase inthickness thereof.

DETAILED DESCRIPTION OF THE INVENTION

While the invention can allow various modifications and alternativeembodiments, specific embodiments thereof are shown by way of example inthe drawings and will be described. However, it should be understoodthat there is no intention to limit the invention to the particularembodiments disclosed, but on the contrary, the invention is to coverall modifications, equivalents, and alternatives falling within thespirit and scope of the invention.

It will be understood that although the terms including ordinal numberssuch as “first,” “second,” etc. may be used herein to describe variouselements, these elements are not limited by these terms. These terms areonly used to distinguish one element from another. For example, a secondelement could be termed a first element without departing from theteachings of the present inventive concept, and similarly a firstelement could be also termed a second element. The term “and/or”includes any and all combination of one or more of the related listeditems.

When an element is referred to as being “connected to” or “coupled with”another element, not only it can be directly connected or coupled to theother element, but also it can be understood that intervening elementsmay be present. In contrast, when an element is referred to as being“directly connected to” or “directly coupled with” another element,there are no intervening elements present.

The terminology used herein is for the purpose of describing particularembodiments only and is not intended to limit the present inventiveconcept. As used herein, the singular forms “a,” “an,” and “the” areintended to include the plural forms as well, unless the context clearlyindicates otherwise. It will be further understood that the terms“comprises” and/or “comprising,” when used in this specification,specify the presence of stated features, integers, steps, operations,elements, and/or components, but do not preclude the presence oraddition of one or more other features, integers, steps, operations,elements, components, and/or groups thereof.

Unless otherwise defined, all terms including technical and scientificterms used herein have the same meaning as commonly understood by one ofordinary skill in the art to which this inventive concept belongs. Itwill be further understood that terms, such as those defined in commonlyused dictionaries, should be interpreted as having a meaning that isconsistent with their meaning in the context of the relevant art andwill not be interpreted in an idealized or overly formal sense unlessexpressly so defined herein.

Hereinafter, embodiments of the present invention will be described indetail with reference to the accompanying drawings, and regardless ofthe numbers in the drawings, the same or corresponding elements will beassigned with the same numbers and overlapping descriptions will beomitted.

FIG. 1 is a diagram of a wireless charging system according to anembodiment of the present invention.

Referring to FIG. 1, a wireless charging system 10 includes a powersource 100, a wireless power transmitting apparatus 200, a wirelesspower receiving apparatus 300, and a load terminal 400.

The wireless power transmitting apparatus 200 is connected to the powersource 100 and receives power from the power source 100. Further, thewireless power transmitting apparatus 200 wirelessly transmits power tothe wireless power receiving apparatus 300. In this case, the wirelesspower transmitting apparatus 200 may transmit power using anelectromagnetic induction method or a resonance method. Although thepower source 100 and the wireless power transmitting apparatus 200 areillustrated as separated elements, the structure is not limited thereto.The power source 100 may be included in the wireless power transmittingapparatus 200.

The wireless power receiving apparatus 300 wirelessly receives powerfrom the wireless power transmitting apparatus 200. The wireless powerreceiving apparatus 300 may also receive power using the electromagneticinduction method or the resonance method. Further, the wireless powerreceiving apparatus 300 provides the received power to the load terminal400.

FIG. 2 is a view illustrating a method of wireless power transmissionand reception for a wireless charging system according to an embodimentof the present invention.

Referring to FIG. 2, the wireless power transmitting apparatus 200 mayinclude a transmitting coil 210. The wireless power receiving apparatus300 may include a receiving coil 310 and a rectifying unit 320.

The power source 100 may generate an alternating current (AC) powerhaving a predetermined frequency and supply it to the transmitting coil210 of the wireless power transmitting apparatus 200.

Further, the alternating current generated by the transmitting coil 210may be delivered to the receiving coil 310, which is inductively coupledto the transmitting coil 210. On the other hand, the power delivered tothe transmitting coil 201 may be delivered to the wireless powerreceiving apparatus 300 having the same resonance frequency as thewireless power transmitting apparatus 200 through a frequency resonancemethod. The power may be transferred between two impedance matched LCcircuits through resonance.

The power which is delivered to the receiving coil 310 using theelectromagnetic induction manner or the resonance method may berectified through the rectifying unit 320 and delivered to the loadterminal 400.

FIG. 3 is an equivalent circuit diagram of a transmitting coil accordingto an embodiment of the present invention.

Referring to FIG. 3, the transmitting coil 210 includes an inductor L1and a capacitor C1, and either end of the inductor L1 may be connectedto either end of the capacitor C1.

Here, the capacitor C1 may be a variable capacitor, and impedancematching may be performed as a capacitance of the capacitor C1 isadjusted. Although an equivalent circuit diagram of the receiving coil310 may also be similar to the equivalent circuit diagram of thetransmitting coil 210, the structure is not limited thereto.

FIG. 4 is an equivalent circuit diagram of a power source and a wirelesspower transmitting apparatus according to an embodiment of the presentinvention.

Referring to FIG. 4, the transmitting coil 210 may include the inductorL1 having an inductance value and the capacitor C1 having a capacitorvalue.

FIG. 5 is an equivalent circuit diagram of a wireless power receivingapparatus according to an embodiment of the present invention.

Referring to FIG. 5, the receiving coil 310 may include an inductor L2having an inductance value and a capacitor C2 having a capacitancevalue.

The rectifying unit 320 may convert the alternating current powerdelivered from the receiving coil 310 into a direct current (DC) power,and deliver the converted direct current power to the load terminal 400.

Specifically, the rectifying unit 320 may include a rectifier and asmoothing circuit, although they are not shown in the drawings. Althoughthe rectifier (e.g., it may be a silicon rectifier) may be equivalentlyrepresented as a diode D1, the rectifier is not limited thereto. Therectifier may convert the alternating current power delivered from thereceiving coil 310 into a direct current power. The smoothing circuitmay remove an alternating element included in the DC power converted inthe rectifier and output smooth DC power. Although, the smoothingcircuit, for example, may be equivalently represented as a capacitor C3,the smoothing circuit is not limited thereto.

The load terminal 400 may be a battery or a device with a built-inbattery.

Meanwhile, the quality factor possesses an important meaning in terms ofwireless power transmission. The quality factor (Q) indicates an indexof energy which may be accumulated around the wireless powertransmitting apparatus 200 or the wireless power receiving apparatus300. The quality factor (Q) may vary depending on an operating frequency(w), a shape, a size, a material, etc. of a coil, and may be representedby the following Equation 1.

Q=w*Ls/Rs  [Equation 1]

Here, Ls is a coil inductance, and Rs indicates a resistancecorresponding to a power loss occurring in the coil itself.

The quality factor may have a value from 0 to infinity, and as thequality factor becomes greater, it may be assumed that efficiency ofpower transmission between the wireless power transmitting apparatus 200and the wireless power receiving apparatus 300 increases.

According to an embodiment of the present invention, increase of coilinductance is intended by including a magnetic substance in a bondinglayer.

FIG. 6 is a top view of a soft magnetic layer and a transmitting coilincluded in a wireless power transmitting apparatus according to anembodiment of the present invention.

Referring to FIG. 6, a transmitting coil 610 is formed on a softmagnetic layer 600. The transmitting coil 610 may be in a wire woundshape such as a spiral or a helical shape on a plane. Although thetransmitting coil 610 may have a round shape, a racetrack shape, arectangular shape, a triangular shape, or a polygonal shape which hasrounded corners, the transmitting coil 610 is not limited to theseshapes thereto.

FIG. 7 is a top view of a soft magnetic layer and a transmitting coilincluded in a wireless power transmitting apparatus according to anotherembodiment of the present invention.

Referring to FIG. 7, transmitting coils 710, 720 and 730 are formed on asoft magnetic layer 700. Each transmitting coil 710, 720 and 730 may bein a wire wound shape such as a spiral or a helical shape on a plane.Although each transmitting coil 710, 720 and 730 may be in a roundshape, a racetrack shape, a rectangular shape, a triangular shape or apolygonal shape which has rounded corners, the shapes are not limitedthereto. The transmitting coil 710 and the transmitting coil 720 aredisposed in parallel, and the transmitting coil 730 may be disposed onthe transmitting coil 710 and the transmitting coil 720.

FIG. 8 is a cross-sectional view of a wireless power transmittingapparatus according to an embodiment of the present invention, and FIG.9 is a cross-sectional view of a bonding layer included in a wirelesspower transmitting apparatus according to an embodiment of the presentinvention.

Referring to FIG. 8, a wireless power transmitting apparatus 800includes a substrate 810, a first bonding layer 820 formed on thesubstrate 810, a soft magnetic layer 830 formed on the first bondinglayer 820, a second bonding layer 840 formed on the soft magnetic layer830 and a transmitting coil 850 formed on the second bonding layer 840.

The substrate 810 may be a plastic material substrate or a metalmaterial substrate. The substrate 810 may also be a PCB (Printed CircuitBoard). The substrate 810 may be a case of the wireless powertransmitting apparatus 800. Thus, the substrate 810 may be used with aninstrument.

The soft magnetic layer 830 may be embodied in various forms such as apellet, a plate, a sheet, a ribbon, a foil, a film, a composite, etc.However, when the wireless power transmitting apparatus 800 is appliedto a vehicle, the pellet is difficult to use due to vibration ortemperature characteristics of vehicles. Thus, the soft magnetic layer830 may include a composite comprising a single metal or an alloypowder/flakes and a polymer resin. Here, although the alloypowder/flakes may include at least one of Fe, Co and Ni alloypowder/flakes and Fe, Si and Cr alloy powder/flakes, they are notlimited thereto. Further, although the polymer resin may include atleast one of a PV (polyvinyl)-based resin, a PE (polyethylene)-basedresin and a PP (polypropylene)-based resin, the polymer resin is notlimited thereto. In this case, the soft magnetic layer 830 may include90 wt % or more of an alloy powder/flakes, and 10 wt % or less of apolymer resin.

The transmitting coil 850 is formed on the soft magnetic layer 830. Thecoil 850 may be wound in a direction parallel to a plane of the softmagnetic layer 830 on the soft magnetic layer 830. Although it is notshown, a support film may further be formed on the transmitting coil850. The support film is for supporting the transmitting coil 850, andit may include a PET (polyethylene terephthalate) material.

Meanwhile, the first bonding layer 820 is formed between the substrate810 and the soft magnetic layer 830, and bonds the substrate 810 and thesoft magnetic layer 830 together. Further, the second bonding layer 840is formed between the soft magnetic layer 830 and the transmitting coil850, and bonds the soft magnetic layer 830 and the transmitting coil 850together. In this case, at least one of the first bonding layer 820 andthe second bonding layer 840 includes a magnetic substance. When atleast one of the first bonding layer 820 and the second bonding layer840 includes a magnetic substance, the effective permeability of thewireless power transmitting apparatus 800 may increase, and theinductance may increase.

Referring to FIG. 9, at least one of the first bonding layer 820 and thesecond bonding layer 840 includes a magnetic layer 900 and a bondingagent 910 formed on both sides of the magnetic layer.

The magnetic layer 900 may be a magnetic sheet, a magnetic film, amagnetic foil, etc. that includes a magnetic substance with highpermeability. Here, although the magnetic substance with a highpermeability may, for example, be a sendust, a permalloy, a MPP(Molybdenum Permalloy Powder), etc., the magnetic substance with highpermeability is not limited thereto. The sendust refers to a Fe—Si—Alternary alloy. The permalloy refers to a Ni—Fe binary alloy.Accordingly, an initial permeability of the magnetic layer 900 may be500μ′ or more, and the difference in the initial permeability betweenthe magnetic layer and the soft magnetic layer 830 may be 100μ′ or moreat a range of 100 to 300 kHz. Here, the magnetic layer 900 may replace adielectric substance film substrate of a general double-sided tape,which bonds the substrate 810 and the soft magnetic layer 830 or thesoft magnetic layer 830 and the coil 850. Accordingly, withoutincreasing an overall thickness of the wireless power transmittingapparatus or the wireless power receiving apparatus, it may be possibleto increase effective permeability, and to increase inductance.

In this case, a metal ribbon may further be formed between the magneticlayer 900 and the bonding agent 910. Here, the metal ribbon may refer toa thin film which is made by spreading out a metal very slightly in asingle atomic unit. Since the permeability of the metal ribbon is veryhigh, without increasing an overall thickness of the wireless powertransmitting apparatus, it may be possible to further increase effectivepermeability, and to increase inductance.

Meanwhile, when permeability of the magnetic layer 900 is higher thanthat of the soft magnetic layer 830, an electromagnetic component may becompensated due to a current conducted between the first bonding layer820 or the second bonding layer 840 and the soft magnetic layer 830.Accordingly, the bonding agent 910 may include an insulation material.For instance, the bonding agent 910 may include an acrylate-basedorganic bonding agent, an epoxy-based organic bonding agent, asilicon-based organic bonding agent, etc.

In other cases, a surface of the first bonding layer 820 or the secondbonding layer 840 may be film-forming processed with SiO₂ or the like.Accordingly, the soft magnetic layer 830 may be insulated from the firstbonding layer 820 or the second bonding layer 840.

Hereinafter, a test result related to inductance of a wireless powertransmitting apparatus according to an embodiment of the presentinvention is explained.

FIG. 10 is a graph, when a bonding layer does not include a magneticsubstance, explaining an increasing rate of inductance according to anincrease in permeability thereof, and FIG. 11 is a graph, when a bondinglayer does not include a magnetic substance, explaining an increasingrate of inductance according to an increase in thickness thereof.

Referring to FIG. 10 and FIG. 11, the inductance increases up to acertain level as permeability (μ′) or thickness increases; however, whenthe inductance arrives at the certain level, it does not increaseanymore, but rather is saturated.

FIG. 12 is a graph, when a bonding layer includes a magnetic substance,explaining an increasing rate of inductance according to an increase inthickness thereof.

Here, a substrate, a soft magnetic layer and a coil are laminated in asequence, and a bonding layer is formed between the substrate and thesoft magnetic layer and between the soft magnetic layer and the coil. Asoft magnetic layer which has permeability (μ) of 26 and a thickness of2.0 mm is used, and a bonding layer between the soft magnetic layer anda coil is fixed at a thickness of 0.1 mm.

After measuring inductance when a bonding layer does not include amagnetic substance (normal), i.e. when using a general double-sided tapein which a bonding agent is formed on both sides of a substrate made byan dielectric film, the inductance was measured while increasing thethickness of a bonding layer from 0.1 mm to 0.4 mm, wherein the bondinglayer included a magnetic substance of which permeability (μ) was 500and a thickness ratio of a magnetic layer and a bonding agent was 7:3.

As shown in FIG. 12, when the bonding layer includes the magneticsubstance (approximately 11.4), it can be found that the inductance ishigher than the case that the bonding layer does not include a magneticsubstance (approximately 11.2). Further, it can be found that even if abonding layer including a magnetic substance becomes thicker, theinductance thereof is not saturated, but rather it increasescontinuously.

Thus, according to an embodiment of the present invention, a wirelesspower transmitting apparatus having high inductance may be achieved.Moreover, a desired level of inductance may be achieved by adjusting thethickness of a bonding layer.

Hereinabove, for the sake of providing a convenient description,although a wireless power transmitting apparatus is described by way ofexamples, the invention is not limited thereto. Embodiments of thepresent invention may also be equally applied to a bonding layer whichis formed between a substrate, a soft magnetic layer and a coil of awireless power receiving apparatus. Further, when a wireless powerreceiving apparatus has a WPC function and NFC function simultaneously,a NFC coil may be further laminated onto a soft magnetic layer. The NFCcoil may be configured to surround an outer circumference of a receivingcoil.

Although exemplary embodiments of the present invention have beenreferenced and described above, it will be understood that it ispossible for those of ordinary skill in the art to implementmodifications and variations on the present invention without departingfrom the concept and scope of the present invention listed in thefollowing appended claims.

DESCRIPTION OF REFERENCE NUMERALS

-   -   10: a wireless charging system    -   100: a power source    -   200: a wireless power transmitting apparatus    -   300: a wireless power receiving apparatus    -   810: a substrate    -   820 and 840: a bonding layer    -   830: a soft magnetic layer    -   850: a coil

What is claimed is:
 1. A wireless power transmitting apparatus,comprising: a substrate; a first transmitting coil and a secondtransmitting coil disposed on the substrate; a third transmitting coildisposed on the first transmitting coil and the second transmittingcoil; and an adhesive disposed between the substrate and the first andthe second transmitting coils, wherein the substrate comprises: a firstportion disposed inside an inner circumference of the first transmittingcoil; a second portion disposed inside an inner circumference of thesecond transmitting coil; a third portion disposed between the firsttransmitting coil and the second transmitting coil; and a peripheralportion disposed outside an outer circumference of the firsttransmitting coil and an outer circumference of the second transmittingcoil, wherein an inner area disposed inside an inner circumference ofthe third transmitting coil overlaps the third portion, a part of thefirst transmitting coil and a part of the second transmitting coil in avertical direction perpendicular to the substrate, wherein the firstportion comprises a first overlapping area overlapping the thirdtransmitting coil in the vertical direction and a first non-overlappingarea not overlapping the third transmitting coil in the verticaldirection, and wherein the second portion comprises a second overlappingarea overlapping the third transmitting coil in the vertical directionand a second non-overlapping area not overlapping the third transmittingcoil in the vertical direction.
 2. The wireless power transmittingapparatus of claim 1, wherein the substrate further comprises: a guideportion disposed between the first transmitting coil and the secondtransmitting coil.
 3. The wireless power transmitting apparatus of claim2, further comprising: lead wires of the third transmitting coil, thelead wires being disposed in the guide portion.
 4. The wireless powertransmitting apparatus of claim 1, wherein the substrate furthercomprises: a recess on a lateral side of the substrate.
 5. The wirelesspower transmitting apparatus of claim 4, further comprising: lead wiresof the third transmitting coil; and terminals of the lead wires, whereinthe terminals of the lead wires of the third transmitting coil aredisposed in the recess.
 6. A wireless power transmitting apparatus,comprising: a substrate; a first transmitting coil and a secondtransmitting coil disposed on the substrate, and a third transmittingcoil disposed on the first transmitting coil and the second transmittingcoil; wherein the substrate comprises: a first portion disposed insidean inner circumference of the first transmitting coil; a second portiondisposed inside an inner circumference of the second transmitting coil;and a third portion disposed between the first transmitting coil and thesecond transmitting coil, and wherein an inner area disposed inside aninner circumference of the third transmitting coil overlaps the thirdportion, a part of the first transmitting coil and a part of the secondtransmitting coil in a vertical direction perpendicular to thesubstrate.
 7. The wireless power transmitting apparatus of claim 6,wherein the substrate further comprises: a guide portion disposedbetween the first transmitting coil and the second transmitting coil. 8.The wireless power transmitting apparatus of claim 7, furthercomprising: lead wires of the third transmitting coil, the lead wiresbeing disposed in the guide portion.
 9. The wireless power transmittingapparatus of claim 6, wherein the first portion and the second portionare located outside an outer circumference of the third transmittingcoil.
 10. The wireless power transmitting apparatus of claim 6, whereinthe substrate comprises a recess on a lateral side.
 11. The wirelesspower transmitting apparatus of claim 10, further comprising: lead wiresof the third transmitting coil; and terminals of the lead wires, whereinthe terminals of the lead wires of the third transmitting coil aredisposed in the recess.
 12. The wireless power transmitting apparatus ofclaim 6, wherein the substrate further comprises: a peripheral portiondisposed outside both an outer circumference of the first transmittingcoil and an outer circumference of the second transmitting coil.
 13. Thewireless power transmitting apparatus of claim 6, further comprising: anadhesive between the substrate and the first and second transmittingcoils.
 14. A wireless power transmitting apparatus, comprising: asubstrate; a first transmitting coil and a second transmitting coildisposed on the substrate, and a third transmitting coil disposed on thefirst transmitting coil and the second transmitting coil; wherein thesubstrate comprises: a first portion disposed inside an innercircumference of the first transmitting coil; a second portion disposedinside an inner circumference of the second transmitting coil; and athird portion disposed between the first transmitting coil and thesecond transmitting coil, wherein the first portion comprises a firstoverlapping area overlapping the third transmitting coil in a verticaldirection perpendicular to the substrate and a first non-overlappingarea not overlapping the third transmitting coil in the verticaldirection, and wherein the second portion comprises a second overlappingarea overlapping the third transmitting coil in the vertical directionand a second non-overlapping area not overlapping the third transmittingcoil in the vertical direction.
 15. The wireless power transmittingapparatus of claim 14, wherein the substrate further comprises: a guideportion disposed between the first transmitting coil and the secondtransmitting coil.
 16. The wireless power transmitting apparatus ofclaim 15, further comprising: lead wires of the third transmitting coil,the lead wires being disposed in the guide portion.
 17. The wirelesspower transmitting apparatus of claim 14, wherein the substrate furthercomprises: a recess on a lateral side of the substrate.
 18. The wirelesspower transmitting apparatus of claim 17, further comprising: lead wiresof the third transmitting coil; and terminals of the lead wires, whereinthe terminals of the lead wires of the third transmitting coil aredisposed in the recess.
 19. The wireless power transmitting apparatus ofclaim 14, wherein the substrate further comprises: a peripheral portiondisposed outside both an outer circumference of the first transmittingcoil and an outer circumference of the second transmitting coil.
 20. Thewireless power transmitting apparatus of claim 14, further comprising:an adhesive between the substrate and the first and second transmittingcoils.